/Engine/Source/Runtime/Engine/Classes/Materials/MaterialExpressionParticleMacroUV.h
This UV node generates texture coordinates in view space centered on the particle system's MacroUVPosition, with tiling controlled by the particle system's MacroUVRadius. It is useful for mapping a 'macro' noise texture in a continuous manner onto all particles of a particle system.
class UMaterialExpressionParticleMacroUV : public [UMaterialExpression](API\Runtime\Engine\Materials\UMaterialExpression)